Vidmenir Knume, who goes by Knu, is an alien cadet from the non-aligned nation of Vidnu. His species experiences a developmental phase called "menir," involving delayed sexual differentiation until adulthood, similar to Frolbericheri Frol's species. This background gives him specific cultural knowledge, enabling him to resolve group confusion about Frol's intersex biology after Frol is seen showering by explaining the concept.

Physically, Knu presents a visibly alien appearance: tall, scaly, blue-eyed, and bald. This starkly contrasts with the predominantly human-like cadets. Aboard the derelict spaceship Esperanza during the survival test, he emerges as the calm voice of reason, maintaining composure and offering logical perspectives during crises. His demeanor remains consistently level-headed, and he steadfastly avoids the paranoia surrounding the mysterious eleventh cadet.

Knu's role extends beyond explaining intersex biology; his understanding of "menir" helps contextualize Frol's situation for the group. He clarifies that sexual differentiation happens naturally on his planet, whereas Frol's species requires medical intervention, highlighting interspecies differences.

Following the Esperanza events, Knu becomes a poet. His acclaimed poetry collection, "Summer of the Menir," achieves significant critical and popular success, suggesting his exam experiences deeply influenced his art. This career path contrasts with the technical or leadership roles chosen by other cadets.